# Auto Stamp vs PD Meter

The clearest difference is ads: Auto Stamp at none against PD Meter's shown. PD Meter's advantage is update cadence (every 4 days vs monthly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Auto Stamp ships an update monthly, PD Meter every 4 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Auto Stamp | PD Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/pd-meter-pupillary-distance/id6784830581/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | — | Ad-supported |
| Size | 19 MB | 65 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Apjam Ltd](https://appshunter.io/developer/603518757) | [heekyung moon](https://appshunter.io/developer/6779193748) |

## What reviewers say

### Auto Stamp

[App page](https://appshunter.io/ios/app/auto-stamp/id6470200439)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### PD Meter

[App page](https://appshunter.io/ios/app/pd-meter-pupillary-distance/id6784830581)

Easily measure your pupillary distance (PD) at home using your phone's camera and a standard card for scale. Get a quick, repeatable estimate in millimeters to order glasses online accurately. The app guides you through the process for reliable results.

**Highlights:** Measure PD with phone camera, Use standard card for scale, Get PD in millimeters, Guided measurement process, Repeatable results for confidence, Single (binocular) PD measurement

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Auto Stamp free?

Auto Stamp is free to download, with no in-app purchases.

### Is PD Meter free?

PD Meter is free to download, with no in-app purchases.

### Do Auto Stamp or PD Meter have ads?

PD Meter shows ads; Auto Stamp does not.

### Which is updated more often, Auto Stamp or PD Meter?

Auto Stamp ships an update monthly, and PD Meter every 4 days. Most recently, Auto Stamp was updated on October 25, 2026 and PD Meter on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*